Sixteen year old Fuza Kodai leads a normal, boring life. He lives with his friend, Otokora Shika, and conveniently their childhood friend, Akiyo Belle, lives right next door.

He longs for something strange to happen. Something like you would see in a manga or a cheesy American movie. Until one day, while walking home they encounter a man, who slayed a monster in front of them.

This certain man tells them about an organization, unknown to the public, only named the "Agency", who deal with the strangest of things. Things like monsters, aliens, superhumans, things that would make you say "impossible".